Type Alias ShardQueryMapByCC<CC, ET, CCLit, K>

Convenience alias for ShardQueryMap that derives ITS (index token subset) from a values-first captured config CC (e.g., your config literal type).

• If CC has indexes, ITS becomes the union of its keys.
• Otherwise, ITS defaults to string.

It also passes CC through the CF channel so per-index page-key narrowing applies consistently.

This is optional DX sugar; it does not change runtime behavior.